Machine for scraping the floor



lune 20, 1933.

J. W. MELLWIG MACHINE FOR SCRAPING THE FLOOR Filed Nov. 2, 1929 INVENTOR*Y Joseph Wilhelm 'Melwlg' au ATTORNEY Patented .lune 20, 1933 entreares JOSEPH WILHELM MELLWG, OF ZURICH, Sl/VITZER-LAND MACINE FORSCRAIE'ING TEE F12-.OOR

Application led November 2, 1929, Serial No. 404,224, and in SwitzerlandNovember 9, 1928.

My invention relates to improvements in floor scraping machines and thelike.

The object of the invention is to provide one or a plurality of layersof steel chips on a roller and securely uniting the chips Within a layerand the layers to one another.

This and other like objects are attained by the novel construction andcombination of parts hereinafter described and shown in the accompanyingdra-Wing, in Which F ig. 1 is a vertical cross-section of a rollerconstructed in accordance with the present invention g lTig. 2 is alongitudinal cross-section of the roller; and

Fig. 3 illustrates in an enlarged view the details of the stitching bymeans of which the steel chips and steel chip layers are held together'.

The device is mounted on a rotatable shaft 1 carrying a hollow shaft 2.rl`he hollow shaft 2 carries sleeves 3 and 4 adapted to slide Withrespect to the hollow shaft 2. Arms 5 are pivotally mounted in ears 6projecting from the sleeves 8 and 4. The cylindrical Wall of the rolleris constituted by sectors 7 from which project ears 8 in Which the outerends of arms 5 are pivot-ally mounted. Adjacent ends of sectors 7 haveundercut o.f'erlapping edges as indicated at 9. A hand wheel 10 formedwith an internal thread is screwed on a threaded portion 11 of thehollow shaft 2, the boss of the hand Wheel contacting with the sleeve 4.The sleeve 4 may thus be moved to the left (Fig. 2) by turning the handWheel 10, causing thereby through the agency of the arms 5, the sectors7 to be moved outward, thus increasing the outer diameter of the roller.

A series of pins 12 projects from the outer wall of each sector 7 tohold in place a cloth of wire, linen or other suitable fabric cover 13.14, land 16 are three layers of steel chips. The innermost layer 14 issewed on the cloth covering 18 by means of a Wire 17, and to theadjacent layer of steel chips 15 by means of a Wire 18, the Wire 18passing through slip knots formed by the Wire 17.

he third outermost layer 16 is secured to the layer 15 by means of asewing Wire 19 which passes through slip knots formed by the Wire 18.The Wires 17, 18 and 19 are preferably of angular cross section and theypass back and forth through the bodies of the masses 14, l5 and 16securely to unite them.

1f the covering is damaged, only the outermost layer 1G of steel chipswill be released from the roller and the scraping of the floor may becontinued With the adjacent layer 15.

If it is desired to detach the cloth covering 13 and the layers 14 to 1Gfrom the roller, this can be readily done by turning the hand Wheel 10to the left and thus reducing the outer diameter of the roller. 6

I claim 1. A scraping unit for floor Scrapers, comprising a supportingmember, a fabric covering therefor, means for retaining the fabriccovering against sliding on the supporting member, a layer of steelchips engaging said fabric covering, and strand material for maintainingsaid steel chips in layer form and for securing said layer to the fabriccovering.

2. A scraping unit for floor scrapers, comprising a tubular supportingmember, means for varying the diameter of said member, a fabric coveringfor said supporting meinber, pins for retaining said fabric covering inposition on said supporting member, a layer of steel chips engaging saidfabric covering, and strand material for maintaining said steel chips inlayer form and for securing said layer to the fabric covering.

3. A scraping unit for floor scrapers, comprising a tubular supportingmember including sectors having overlapping edges, a fabric covering forsaid supporting memn ber, means for retaining the fabric covering inposition on said supporting member, a layer of steel chips engaging saidfabric covering, and strand material for maintaining said steel chips inlayer form and for securing said layer to the fabric covering.

4. A scraping unit for floor Scrapers, including a layer of steel chips,said layer comprising a mass of superimposed steel chips and a Wireangular in cross section passing back and forth through the body UJI ofsaid mass whereby the latter is securely united.

5. A scraping unit for floor Scrapers, including a series of overlyinglayers of steel chips, each layer Comprisinga mass of superimposed steelChips and strand material passing back and forth through each layer7 thestrand material of one layer passing through loops in the strandmaterial of an adjacent layer to secure the several layers together.

In testimony whereof I have signed my name to this specification.

JOSEPH WILHELM MELLVVIG.

